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STP-H600/H1000 Series Instruction Manual
6.2 Restarting after Any Safety Function Operates
1) In case of a power failure:
Establish a sequence so that power can be supplied to the STP control unit immediately
after a power recovery.
2) In case the "FAILURE" lamp lights due to an overload of the inverter
(the STP pump continues rotating by inertia: [FREE RUN state]):
<MANUAL OPERATION>
(1) Press the "MOTOR STOP" switch. The "FAILURE" lamp goes out and the FREE RUN
state is reset.
(2) Press the "MOTOR START" switch and press the "MOTOR STOP" switch again. The
brake functions and the STP pump decelerates.
(3) After the STP pump stops thoroughly (the "BRAKE" lamp goes out: the needle of the
tachometer is in the red), turn "OFF" the "POWER ON/OFF" switch, switch the breaker
"OFF," and remove probable causes of the abnormality/error.
(4) Restart the STP pump and check if it operates correctly.
<REMOTE OPERATION>
(1) Slide the "MANUAL/REMOTE" changeover switch on the rear panel to “MANUAL.”
(2) Press the "MOTOR STOP" switch. The "FAILURE" lamp goes out and the FREE RUN
state is reset.
(3) Press the "MOTOR START" switch and press the "MOTOR STOP" switch again. The
brake functions and the STP pump decelerates.
(4) After the STP pump stops thoroughly (the "BRAKE" lamp goes out: the needle of the
tachometer is in the red) , switch the breaker "OFF," and remove probable causes of the
abnormality/error.
(5) Restart the STP pump and check if it operates correctly.
<In case the FREE RUN state is not reset after troubleshooting:>
(1) Check the tachometer on the front panel.
(2) If the needle is in the red, it means the STP pump has stopped.
Power OFF and switch the breaker "OFF."
(3) If the needle is in the black, the STP pump is rotating.
Wait for it to enter the red. Then, power OFF and switch the breaker "OFF."
(4) Restart the STP pump and check if operates correctly.
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DO NOT power OFF and switch the breaker OFF until the needle is in the red.
NOTICE
If the FREE RUN state cannot be reset, it takes about 8 to 10 hours to stop the
STP pump (the needle is in the red) because it rotates by inertia.
To stop the STP pump quickly, close the vacuum valve at the outlet port flange
and introduce gas from the purge port into the STP pump.
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